This one is how many different people need to have cast at least one flag on a post in the topic for it to be eligible for auto-closing (default 5). This stops one person getting giddy and flagging everything, forcing an auto-close.
This one is based on the combined score of the reviewables. The higher the sensitivity, the lower the score needed. So a tranche of low-scoring ‘something else’ flags may not trigger an auto-close even if more than 5 people sent one in.